Polymerizable compound, polymerizable composition, optical material, optical element and optical head device

1. A polymerizable compound represented by the following formula (1):

wherein A is a hydrogen atom or a group selected from the following formulae (2) to (5):

V w H (3-W) C—  (2)

Ph x Y (3-x) Si—  (3)

J-(CH 2 ) m1 —CH l (CH 3 ) (2-l) —  (4)

J-(CH 2 ) n1 —SiPh p1 (CH 3 ) (2-p1) —  (5);

B is a group selected from the following formulae (6) and (7):

J-(CH 2 ) m2 —CH k (CH 3 ) (2-k) —  (6)

J-(CH 2 ) n2 —SiPh p2 (CH 3 ) (2-p2) —  (7);

w is an integer of from 0 to 3;

V is a methyl group or an ethyl group, provided that when w is from 2 to 3, a plurality of V's may be different groups, x is an integer of from 0 to 3, Y is a group selected from a methyl group, a cyclohexyl group, a tert-butyl group, a sec-butyl group and an isopropyl group, provided that when x is 0 or 1, a plurality of Y's may be different groups, J is a group selected from CH 2 ═CR—COO—, an epoxy group, a vinyl group and a vinyl ether group, R is a hydrogen atom or a methyl group, I is an integer of from 0 to 1, k is an integer of from 0 to 2, provided that when A is a hydrogen atom, k is not 2, each of m 1 and m 2 which are independent of each other, is from 0 to 12, each of n 1 and n 2 which are independent of each other, is from 1 to 12, and each of p 1 and p 2 which are independent of each other, is from 0 to 2;

provided that some or all of hydrogen atoms in the substituent V in the formula (2), the phenyl group and the substituent Y in the formula (3) and the alkylene group in the formulae (4) to (7) may be substituted by a methyl group, a methoxy group or a fluorine atom, and some or all of hydrogen atoms in the biphenyl group or the biphenylene group may be substituted by a methyl group, a methoxy group or a fluorine atom.

2. The polymerizable compound according to claim 1 , wherein A is a group represented by the formula (3).

3. The polymerizable compound according to claim 2 , wherein A is a triphenylsilyl group.

4. The polymerizable compound according to claim 1 , wherein A is a triphenylsilyl group, and B is a group represented by the formula (7).

5. The polymerizable compound according to claim 1 , wherein A is a group represented by the formula (5), and B is a group represented by the formula (7).

6. The polymerizable compound according to claim 1 , wherein when B is a group represented by the formula (6), k=0.

7. The polymerizable compound according to claim 1 , wherein when B is a group represented by the formula (7), p 2 =0.

8. The polymerizable compound according to claim 1 , wherein A is a tert-butyl group.

9. The polymerizable compound according to claim 1 , wherein each of m 1 and m 2 which are independent of each other, is from 1 to 2, and each of n 1 and n 2 which are independent of each other, is from 1 to 3.

10. A polymerizable composition comprising the polymerizable compound as defined claim 1 .

11. An optical material obtained by curing the polymerizable composition as defined in claim 10 .

12. An optical element using the optical material as defined in claim 11 .

13. An optical head device using the optical element as defined in claim 12 .